Revert "Avoid creation of the free space map for small heap relations."

Amit Kapila <akapila@postgresql.org>

Commit: a23676503b746b7f1588cd2ab0c60411032d32da
Author: Amit Kapila <akapila@postgresql.org>
Date: 2019-01-28T06:01:44Z
Releases: 12.0
Revert "Avoid creation of the free space map for small heap relations."

This reverts commit ac88d2962a96a9c7e83d5acfc28fe49a72812086.

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